str1 = '111'
print(str1)
str2 = "222"
str3 = '''333
44
5555
66'''

print('{0}---{1}---{2}'.format(1,2,3))
str4 = '666'
print(f'这个程序{str4}')

i=2
j=3
print(f'{i}*{j}={i*j}')

sep = ','
print(sep.join(str4))

str5 = 'good good study'

